another bouncy floor follow-up question
Thanks for the responses a few days ago about my bouncy floor that I need to repair from the top down. (from the 2nd floor, not a basement). Quick recap - 1939 cottage home with funky 2nd floor addition from 1990. Floor joists on 2nd floor are actually the 2x6 1st floor ceiling on 16" centers with 13ft span. Would like to reinforce and make less bouncy while we have it all torn up.
Local lumber yard guy recommends putting additional 2x6 in between the existing ones. That would give me 2x6 joists on 8" centers with a maximum span of 13feet. Top that with tongue&groove 4x8 floor decking.
Would you do that instead of sistering the existing joists? Any pros/cons to one way or the other?